-noun
a person who compensates for latent frustrations over prejudices against her own race or gender by contributing to the scapegoating of other minorities, of which she is not a part, so as to make herself feel more connected to and accepted by the majority.

When he was a child, he used to get the shit beaten out of him by the rich, white kids; then he grew up, made a lot of money and became a malkin. Now he spends all his time campaigning against gay rights.

A backpack which is longer than it is wide. Made famous by a student at the Alternative Community School in central New York.
Sometimes, a Malkin can grow or shrink throughout the day without reason for why or how.